package com.hmdp.utils;


import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Component;

import java.time.format.DateTimeFormatter;
import java.time.LocalDateTime;
import java.time.ZoneOffset;

@Component
public class RedisIdWorker {

    private static final long BEGIN_TIMESTAMP=1735689600L;
    private static final int COUNT_BITS=32;

    private StringRedisTemplate stringRedisTemplate;

    public RedisIdWorker(StringRedisTemplate stringRedisTemplate) {
        this.stringRedisTemplate = stringRedisTemplate;
    }

    public long nextId(String keyPrefix) {
        //生成时间戳
        LocalDateTime now = LocalDateTime.now();
        long nowSecond = now.toEpochSecond(ZoneOffset.UTC);
        long timestamp = nowSecond-BEGIN_TIMESTAMP;
        //生成序列号
        String date = now.format(DateTimeFormatter.ofPattern("yyyy:MM:dd"));
        Long count = this.stringRedisTemplate.opsForValue().increment("icr:" + keyPrefix + ":" + date);

        //拼接并返回
        return (timestamp<<=COUNT_BITS)|count;
    }

    public static void main(String[] args) {
        LocalDateTime time = LocalDateTime.of(2025,1,1,0,0,0);
        long second = time.toEpochSecond(ZoneOffset.UTC);
        System.out.println("second = " + second);
    }
}
